I don't see why not. From what I understand of giant animals from the past, and even now, on our planet they need higher levels of oxygen than we
currently have in all areas that aren't dense rainforests.

If the Aliens had a high enough amount of whatever they breathe to support their massive bodies, it's possible

dinosaurs and stuff were really big because the enviroment had a lot more oxygen, so if they could get big on ours they could probly still get big on
theirs. creatures on this earth in the past have gotten huge though.

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